private static Socket ConnectSocket(string server, int port)

        {

            Socket socket = null;                    //实例化Socket对象，并初始化为空

            IPHostEntry iphostentry = null;          //实例化IPHostEntry对象，并初始化为空

            iphostentry = Dns.GetHostEntry(server);  //获得主机信息

            //循环遍历得到的IP地址列表

            foreach (IPAddress address in iphostentry.AddressList)

            {

                //使用指定的IP地址和端口号实例化IPEndPoint对象

                IPEndPoint IPEPoint = new IPEndPoint(address, port);

                //使用Socket的构造函数实例化一个Socket对象，以便用来连接远程主机

                Socket newSocket = new Socket(IPEPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

                newSocket.Connect(IPEPoint);          //调用Connect方法连接远程主机

                if (newSocket.Connected)              //判断远程连接是否连接

                {

                    socket = newSocket;

                    break;

                }

                else

                {

                    continue;

                }

            }

            return socket;

        }

        //获取指定服务器的主页面内容

        private static string SocketSendReceive(string server, int port)

        {

            string request = "GET/HTTP/1.1\\n主机:" + server + "\\n连接:关闭\\n";

            Byte[] btSend = Encoding.ASCII.GetBytes(request);

            Byte[] btReceived = new Byte[256];

            //调用自定义方法ConnectSocket，使用指定的服务器名和端口号实例化一个Socket对象

            Socket socket = ConnectSocket(server, port);

            if (socket == null)

                return ("连接失败！");

            //将请求发送到连接的服务器

            socket.Send(btSend, btSend.Length, 0);

            int intContent = 0;

            string strContent = server + "上的默认页面内容:\\n";

            do

            {

                //从绑定的Socket接收数据

                intContent = socket.Receive(btReceived, btReceived.Length, 0);

                //将接收到的数据转换为字符串类型

                strContent += Encoding.ASCII.GetString(btReceived, 0, intContent);

            }

while (intContent > 0);

            return strContent;

        }

        private void button1_Click(object sender, EventArgs e)

        {

            string server = textBox1.Text;               //指定主机名

            int port = Convert.ToInt32(textBox2.Text);   //指定端口号

            //调用自定义方法SocketSendReceive获取指定主机的主页面内容

            string strContent = SocketSendReceive(server, port);

            MessageBox.Show(strContent);

        }下载本文